linux-kernel - [ 43/46] crypto: xor - Check for osxsave as well as avx in crypto/xor

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Date:	Thu, 12 Sep 2013 10:58:54 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, John Haxby <john.haxby@...cle.com>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	Michael Marineau <michael.marineau@...eos.com>
Subject: [ 43/46] crypto: xor - Check for osxsave as well as avx in crypto/xor

3.10-stable review patch.  If anyone has any objections, please let me know.

------------------

From: John Haxby <john.haxby@...cle.com>

commit edb6f29464afc65fc73767540b854abf63ae7144 upstream.

This affects xen pv guests with sufficiently old versions of xen and
sufficiently new hardware.  On such a system, a guest with a btrfs
root won't even boot.

Signed-off-by: John Haxby <john.haxby@...cle.com>
Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>
Reported-by: Michael Marineau <michael.marineau@...eos.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/x86/include/asm/xor_avx.h |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/arch/x86/include/asm/xor_avx.h
+++ b/arch/x86/include/asm/xor_avx.h
@@ -167,12 +167,12 @@ static struct xor_block_template xor_blo
 
 #define AVX_XOR_SPEED \
 do { \
-	if (cpu_has_avx) \
+	if (cpu_has_avx && cpu_has_osxsave) \
 		xor_speed(&xor_block_avx); \
 } while (0)
 
 #define AVX_SELECT(FASTEST) \
-	(cpu_has_avx ? &xor_block_avx : FASTEST)
+	(cpu_has_avx && cpu_has_osxsave ? &xor_block_avx : FASTEST)
 
 #else
 


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